MD

Maryland, Old Line State, Free State, MD, Md.

(noun) a Mid-Atlantic state; one of the original 13 colonies

doctor, doc, physician, MD, Dr., medico

(noun) a licensed medical practitioner; “I felt so bad I went to see my doctor”

mendelevium, Md, Mv, atomic number

(noun) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)

Source: WordNet® 3.1